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At least in the federal state of Hesse a fax isn't considered safe: (German) https://www.heise.de/news/Datenschutzbeauftragter-Gaengiges-Faxen-nicht-mit-der-DSG

• schroeding 5y ago
  ... anymore. It was seen as safe until the last old ISDN / analogue landlines were converted to VoIP ones, which was really not that long ago :D